2.6.28-20103103+0m5 is a version in the last firmware version PR 1.3 and PR1.3.1. So you first should update to last Maemo version and then install U-Boot. Search for firmware files: PR1.3.1 - RX-51_2009SE_21.2011.38-1_PR_COMBINED_MR0_ARM.bin PR1.3 - RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin If you are hard hacker, you can find DEB packages in repository: http://repository.maemo.org/pool/mae...free/k/kernel/